Grundfos ALPHA SOLAR 25-145 180 Circulating Pump

The Grundfos ALPHA SOLAR 25-145 180 circulator pump is an efficient and advanced solution specifically designed for solar thermal energy systems in domestic applications. This pump is ideal for integration into solar thermal systems, optimising water flow and ensuring that the heat captured by solar panels is efficiently distributed throughout the heating or hot water system. With its high-efficiency ECM (electronically commutated motor), the ALPHA SOLAR offers outstanding performance with low energy consumption, making it a sustainable and economical choice for solar energy systems.

Adaptive control for maximum efficiency:
One of the main features of the ALPHA SOLAR 25-145 180 is its ability to be controlled via a PWM (pulse width modulation) signal, which can come from a solar controller. This PWM speed control allows precise adjustment of the pump speed based on the solar thermal system's needs, optimising water flow and solar heat collection. Thanks to this system, the pump adjusts its operation to reduce energy consumption when full capacity operation is not needed, resulting in significant long-term savings.

If a PWM signal is not available, the ALPHA SOLAR can operate at a constant speed, allowing the solar controller to simply turn the pump on or off according to the system's needs. This ensures great flexibility as the pump can adapt to different configurations and controllers without compromising its efficiency.

Robust design and high durability materials:
The Grundfos ALPHA SOLAR 25-145 180 is constructed with high-quality materials that ensure a long service life even in demanding conditions. The pump body is made of cast iron (EN 1561 EN-GJL-150), providing excellent corrosion resistance, while the impeller is made of composite material (PES+30% GF), ensuring reliable and wear-resistant performance. These materials allow the pump to operate efficiently for years without frequent maintenance, making it a durable and reliable option for solar thermal systems.

Quiet operation and maintenance-free:
One of the key advantages of the ALPHA SOLAR is its quiet operation. With a very low noise level, it is ideal for domestic applications where comfort and tranquillity are important. Additionally, thanks to its wet rotor design, the bearings are lubricated by the pumped fluid, eliminating the need for regular maintenance and ensuring uninterrupted operation over time. This also helps prolong the pump's lifespan, reducing operational and maintenance costs.

High performance and energy efficiency:
The ALPHA SOLAR 25-145 180 has a nominal flow rate of 2.77 m³/h and a nominal head of 12.46 metres, making it a powerful and efficient pump for heat distribution in solar thermal systems. Furthermore, its energy efficiency index (EEI) of 0.20 is a testament to its ability to deliver high performance with minimal electrical consumption. The input power ranges from 2 W to 60 W, ensuring the pump only uses the energy necessary for its operation, optimising solar energy use and minimising electricity costs.

Simple and adaptable installation:
The ALPHA SOLAR is designed for easy installation. With a port-to-port length of 180 mm and 1 1/2 inch connections, it can be easily integrated into most solar thermal systems. Its compact and lightweight design, with a net weight of 2.27 kg, facilitates handling and assembly, reducing the time and effort required for installation.

Outstanding technical features:

• Liquid temperature range: 2°C to 110°C, making it suitable for systems operating with hot water at high temperatures.
• Maximum working pressure: 10 bar, ensuring reliable operation in high-pressure systems.
• Protection class: IPX4D, providing adequate protection against water splashes, suitable for outdoor or wet area applications.
• Nominal voltage: 1 x 230 V, with a current consumption range of 0.04 to 0.58 A, ensuring low energy consumption.

The Grundfos ALPHA SOLAR 25-145 180 circulator pump is an efficient, durable, and adaptable solution for solar thermal systems. Its ability to operate with PWM signals and its low energy consumption design make it an ideal choice for those looking to optimise the performance of their solar energy systems, reducing costs and maximising solar heat collection.